Eichaed haynn



Patented Feb. 21, 1933 UNITED STATES PATENT OFFICE V RICHARD HAYNN, FFRANKFORT-ON-THE-MAIN-FEGHENHEIM, GERMANY, ASSIGNOR TO GENERAL ANILINEWORKS, INC., OF NEW YORK, N. Y., A CORPORATION OF DELA- WARE rnocnss FORMANUFACTURING PIECE-DYED woonmr FABRICS conmmmo sensors on SILK NoDrawing. Application filed September 10, 1928, Serial N 0. 305,146, andin Germany September It, 1927.

The present invention relates to a process of manufacturing piece-dyedwoolenfabrrcs containing effects of silk, more particularly it relatesto a process of obtaining clean effects of silk in piece-dyed woolenfabrics.

It is highly desirable, when dyeing woolen fabrics containing effects ofsilk, that these effects remain clean and do not take on the wooldyestuff.

I have now found that this purpose is accomplished if :sulfonic acids oforganic compounds, capable of precipitating glue and gelatin from anacid solution, are added to the dye baths. The products, described forinstance in the U. S. Patents No. 1,237,405, No. 1,796,801 and No.1,336,759, being condensation products from formaldehyde and phenols orphenol sulfonic acids or sulfonic acids of the naphthalene series andlikewise products obtainable by acting with sulfur trioxide onunsaturated higher fatty or hydroxyfatty acids or their esters, areparticularly suitable for my process. The addition of these compounds isadvantageously carried out during the dyeing process, or, if chromabledyestuffs are used, before afterchroming.

My new process has the further advantage that a greater nuinber ofdifferent dyestuffs than was hitherto possible can be employed fordyeing fabrics of this kind. Two-colored effects, especially areproduced in a particularly clear state by this process.

In order to further illustrate my invention the following examples aregiven, but I wish it to be understood that my invention is not limitedto the examples given, nor to the exact conditions stated therein.

I Example 1 the goods are rinsed and dried. The effects of silk remainclean white. I

Example 2 i A woolen fabric containing whiteeifects of silk is dyed inthe usual manner with 8% of anthracene acid black ST Colour Index No.303 with the addition of formic acid. After boiling for about 1' hour,10% of the product, obtained by acting with sulfur trioxide in the formof fuming sulfuric acid on castor oil as described in U. S. Patent No.1,796,801, are added. Then the dyeing is continued at the boiling pointfor half an hour. Thereafter the black dyeing is developed in the knownmanner and afterchromed, for instance with 2.5% of postassiumbichromate, for half-an-hour while hot. The effects of silk remainsclean white.

I claim:

1. A process for obtaining clean effects of organic sulfonic acidcompounds of the group consisting ofcondensation products offormaldehyde with phenol-sulfonic acids or naphthalene-sulfonic acidsand of sulfonation products prepared from sulfur trioxide andunsaturated fattyor hydroxy fatty acids or their esters to the dye-bath.

2. A process for obtaining clean effects of silk in piece-dyed woolenfabrics which comprises dyeing woolen fabrics containing effects of silkwith wool dyestuffs and adding organic sulfonic acid compounds, of thegroup consisting of condensation products of formaldehyde withphenol-sulfonic acids or naphthalene-sulfonic acids and of sulfonationproducts prepared from sulfur trioxide and unsaturated fattyor hydroxyfatty acids or their esters to the dye-bath, during thedyenaphthalene-sulfonic acids and of sulfonation products pre ared fromsulfur trioxide and unsaturated attyor hydroxy fatty acids or theiresters to the dye-bath, during the dyeing process and then afterchromingthe fabrics.

In testimony whereof, I afiix my signature.

RICHARD HAYNN.

